SpringBoot使用自定义json解析器的使用方法

2023-09-14 13:00:05 162

Spring-Boot是基于Spring框架的，它并不是对Spring框架的功能增强，而是对Spring的一种快速构建的方式。

Spring-boot应用程序提供了默认的json转换器，为Jackson。示例：

pom.xml中dependency配置：


4.0.0
com.qinker
spring-boot
war

org.springframework.boot
spring-boot-starter-parent
2.0.0.RELEASE

0.0.1-SNAPSHOT
spring-boot
http://maven.apache.org

UTF-8
9




org.springframework.boot
spring-boot-starter-web




spring-boot

创建三个类：MainApp.java和User.java以及HelloController.java：

packagecom.springboot;
importjava.util.Date;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RestController;
@RestController
publicclassHelloController{

@RequestMapping("/hello")
publicStringhello(){
return"hello,SpringBoot";
}

/**
*Springboot默认json解析框架是Jackson
*@return
*/
@RequestMapping("/getUser")
publicUsergetUser(){
Useru=newUser();
u.setName("张三");
u.setAge(33);
u.setCreateTime(newDate());
returnu;
}
}

packagecom.springboot;
importjava.io.Serializable;
importjava.util.Date;
publicclassUserimplementsSerializable{
privateStringname;
privateintage;
privateDatecreateTime;
publicStringgetName(){
returnname;
}

publicvoidsetName(Stringname){
this.name=name;
}

publicintgetAge(){
returnage;
}

publicvoidsetAge(intage){
this.age=age;
}

publicDategetCreateTime(){
returncreateTime;
}

publicvoidsetCreateTime(DatecreateTime){
this.createTime=createTime;
}
}

packagecom.springboot;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
publicclassMainApp{
publicstaticvoidmain(String[]args){
SpringApplication.run(MainApp.class,args);
}
}

启动MainApp：访问http://localhost:8080/getUser,结果如下：

{"name":"张三","age":33,"createTime":"2018-04-04T03:03:08.534+0000"}

可见：我们并未做任何配置，返回的却是json数据，可见Spring-Boot对json做了默认实现，使用的是内置Jackson转换器。

那么，下面看看如何使用自定义的json转换器，这里以fastjson为例：

首先，引入fastjson包，在pom中添加如下依赖：



com.alibaba
fastjson
1.2.47

为了方便看出效果：修改User类：

packagecom.springboot;
importjava.io.Serializable;
importjava.util.Date;
importcom.alibaba.fastjson.annotation.JSONField;
@SuppressWarnings("serial")
publicclassUserimplementsSerializable{
privateStringname;
privateintage;
@JSONField(format="yyyy-MM-ddHH:mm")
privateDatecreateTime;
publicStringgetName(){
returnname;
}

publicvoidsetName(Stringname){
this.name=name;
}

publicintgetAge(){
returnage;
}

publicvoidsetAge(intage){
this.age=age;
}

publicDategetCreateTime(){
returncreateTime;
}

publicvoidsetCreateTime(DatecreateTime){
this.createTime=createTime;
}
}

1.实现fastjson自定义json转换的第一种方式，Spring-Boot实现WebMvcConventer接口：

修改MainApp如下：

packagecom.springboot;
importjava.util.ArrayList;
importjava.util.List;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
importorg.springframework.http.MediaType;
importorg.springframework.http.converter.HttpMessageConverter;
importorg.springframework.web.servlet.config.annotation.WebMvcConfigurer;
importcom.alibaba.fastjson.serializer.SerializerFeature;
importcom.alibaba.fastjson.support.config.FastJsonConfig;
importcom.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
@SpringBootApplication
publicclassMainAppimplementsWebMvcConfigurer{
@Override
publicvoidconfigureMessageConverters(List>converters){
WebMvcConfigurer.super.configureMessageConverters(converters);
//创建fastjson转换器实例
FastJsonHttpMessageConverterconverter=newFastJsonHttpMessageConverter();
//配置对象
FastJsonConfigconfig=newFastJsonConfig();
ListmediaTypes=newArrayList<>();
//中文编码
MediaTypemediaType=MediaType.APPLICATION_JSON_UTF8;
mediaTypes.add(mediaType);
config.setSerializerFeatures(SerializerFeature.PrettyFormat);
converter.setSupportedMediaTypes(mediaTypes);
converter.setFastJsonConfig(config);
converters.add(converter);
}

publicstaticvoidmain(String[]args){
SpringApplication.run(MainApp.class,args);
}
}

启动程序：访问上面的路径：浏览器会看到如下结果：

{
"age":33,
"createTime":"2018-04-0411:14",
"name":"张三"
}

2.使用@Bean注解注入fastjson转换器：修改MainApp如下：

packagecom.springboot;
importjava.util.ArrayList;
importjava.util.List;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
importorg.springframework.boot.autoconfigure.http.HttpMessageConverters;
importorg.springframework.context.annotation.Bean;
importorg.springframework.http.MediaType;
importcom.alibaba.fastjson.serializer.SerializerFeature;
importcom.alibaba.fastjson.support.config.FastJsonConfig;
importcom.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
@SpringBootApplication
publicclassMainApp{
@Bean
publicHttpMessageConvertersfastJsonHttpMessageConventers(){
FastJsonHttpMessageConverterconverter=newFastJsonHttpMessageConverter();
FastJsonConfigconfig=newFastJsonConfig();
config.setSerializerFeatures(SerializerFeature.PrettyFormat);
ListmediaTypes=newArrayList<>();
mediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
converter.setSupportedMediaTypes(mediaTypes);
returnnewHttpMessageConverters(converter);
}

publicstaticvoidmain(String[]args){
SpringApplication.run(MainApp.class,args);
}
}

访问结果是一样的。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

SpringBoot使用自定义json解析器的使用方法

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